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Subject[PATCH] oom-killer kills more than needed
Signed-off-by: Chad Zanonie

This mod firstly replaces a !p->mm check with PF_KTHREAD to more
accurately identify
kthreads. Secondly, it adds a (p->state & TASK_DEAD) check to identify processes
that have released their mm entirely. Not waiting for a process to finish
releasing its memory entirely can cause the OOM killer to kill another
application unnecessarily (while p->mm is null but memory isn't yet available).


diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 64e5b4b..f325a87 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -216,7 +216,7 @@ static struct task_struct
*select_bad_process(unsigned long *ppoints,
* skip kernel threads and tasks which have already released
* their mm.
*/
- if (!p->mm)
+ if (p->flags & PF_KTHREAD || p->state & TASK_DEAD)
continue;
/* skip the init task */
if (is_global_init(p))

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